What you need:
(make sure there is no paper covering the crayons)
Hot glue gun
Cover the table or space with newspaper so that when you use the blow dryer the crayon will not spill or stain.
Place the canvas on top of the newspaper and paste hot glue on each of the crayons and stick them on the canvas make sure it is stuck on completely.
When the glue has dried, make sure you have an adult or someone older to help youmelt the crayon and watch carefully as the crayon melt across the canvas.